The Last Guest, also known as Guest 1337, is the protagonist of Roblox animation series "The Last Guest". It follows the story of how "Bacon Hairs" (another prominent type of character on Roblox), declared war on Robloxia, because they harness a deep hatred for Guests.
Day by day, people of his kind were getting killed off; eventually leading to the death of his own parents.
Not only is he capable of using firearms and other weapons, The Last Guest is also incredibly strong when it comes to hand-to-hand combat.
With courage in his heart and justice in his hands, Guest 1337 fought not for vengeance, but for a future where no child would have to endure the pain he once did. The last of his kind—but never alone.

As for his voice description, I expect him to sound very strong, someone who knows what he's doing; maybe even the anchor of your team. I expect him to be loud (maybe even yelling) at times due to his military training, but at the same time he can get very polite and caring for those around him.